The University of California is preparing to open two new medical schools to help train more physicians for underserved rural and minority communities. While the schools won't be open for four or five years, they are intended to help fill a growing shortage of physicians in the state, officials say. In addition to planning the new schools, UC is working to add slots at its existing medical schools in San Francisco, Los Angeles, San Diego, Davis, and Irvine, which now enroll about 2,540 students.